0000950129-07-001272 424B5 1 20070309 20070309 WASTE MANAGEMENT INC 0000823768 4953 731309529 DE 1231 424B5 33 333-137526 07683944 1001 FANNIN STREET STE 4000 HOUSTON TX 77002 7135126200 1001 FANNIN STREET SUITE 4000 HOUSTON TX 77002 USA WASTE SERVICES INC 19920703 424B5 1 h44480b5e424b5.htm PROSPECTUS SUPPLEMENT - REGISTRATION NO. 333-137526